학술논문
TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
Document Type
Working Paper
Author
Hawthorn, Faith; Bayliss, Daniel; Wilson, Thomas G.; Bonfanti, Andrea; Adibekyan, Vardan; Alibert, Yann; Sousa, Sérgio G.; Collins, Karen A.; Bryant, Edward M.; Osborn, Ares; Armstrong, David J.; Abe, Lyu; Acton, Jack S.; Addison, Brett C.; Agabi, Karim; Alonso, Roi; Alves, Douglas R.; Anglada-Escudé, Guillem; Bárczy, Tamas; Barclay, Thomas; Barrado, David; Barros, Susana C. C.; Baumjohann, Wolfgang; Bendjoya, Philippe; Benz, Willy; Bieryla, Allyson; Bonfils, Xavier; Bouchy, François; Brandeker, Alexis; Broeg, Christopher; Brown, David J. A.; Burleigh, Matthew R.; Buttu, Marco; Cabrera, Juan; Caldwell, Douglas A.; Casewell, Sarah L.; Charbonneau, David; Charnoz, Sébastian; Cloutier, Ryan; Cameron, Andrew Collier; Collins, Kevin I.; Conti, Dennis M.; Crouzet, Nicolas; Czismadia, Szilárd; Davies, Melvyn B.; Deleuil, Magali; Delgado-Mena, Elisa; Delrez, Laetitia; Demangeon, Olivier D. S.; Demory, Brice-Olivier; Dransfield, Georgina; Dumusque, Xavier; Egger, Jo Ann; Ehrenreich, David; Eigmüller, Philipp; Erickson, Anders; Essack, Zahra; Fortier, Andrea; Fossati, Luca; Fridlund, Malcolm; Günther, Maximilian N.; Güdel, Manuel; Gandolfi, Davide; Gillard, Harvey; Gillon, Michaël; Gnilka, Crystal; Goad, Michael R.; Goeke, Robert F.; Guillot, Tristan; Hadjigeorghiou, Andreas; Hellier, Coel; Henderson, Beth A.; Heng, Kevin; Hooton, Matthew J.; Horne, Keith; Howell, Steve B.; Hoyer, Sergio; Irwin, Jonathan M.; Jenkins, James S.; Jenkins, Jon M.; Jensen, Eric L. N.; Kane, Stephen R.; Kendall, Alicia; Kielkopf, John F.; Kiss, Laszlo L.; Lacedelli, Gaia; Laskar, Jacques; Latham, David W.; Etangs, Alain Lecavalier des; Leleu, Adrien; Lendl, Monika; Lillo-Box, Jorge; Lovis, Christophe; Mékarnia, Djamel; Massey, Bob; Masters, Tamzin; Maxted, Pierre F. L.; Nascimbeni, Valerio; Nielsen, Louise D.; O'Brien, Sean M.; Olofsson, Göran; Osborn, Hugh P.; Pagano, Isabella; Pallé, Enric; Persson, Carina M.; Piotto, Giampaolo; Plavchan, Peter; Pollacco, Don; Queloz, Didier; Ragazzoni, Roberto; Rauer, Heike; Ribas, Ignasi; Ricker, George; Ségransan, Damien; Salmon, Sébastien; Santerne, Alexandre; Santos, Nuno C.; Scandariato, Gaetano; Schmider, François-Xavier; Schwarz, Richard P.; Seager, Sara; Shporer, Avi; Simon, Attila E.; Smith, Alexis M. S.; Srdoc, Gregor; Steller, Manfred; Suarez, Olga; Szabó, Gyula M.; Teske, Johanna; Thomas, Nicolas; Tilbrook, Rosanna H.; Triaud, Amaury H. M. J.; Udry, Stéphane; Van Grootel, Valérie; Walton, Nicholas; Wang, Sharon X.; Wheatley, Peter J.; Winn, Joshua N.; Wittenmyer, Robert A.; Zhang, Hui
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Abstract
We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with a mass of $0.68\pm0.05$ M$_{\odot}$ and a radius of $0.67\pm0.01$ R$_{\odot}$. We obtain photometric follow-up observations with a variety of facilities, and we use these data-sets to determine that the inner planet, TOI-836 b, is a $1.70\pm0.07$ R$_{\oplus}$ super-Earth in a 3.82 day orbit, placing it directly within the so-called 'radius valley'. The outer planet, TOI-836 c, is a $2.59\pm0.09$ R$_{\oplus}$ mini-Neptune in an 8.60 day orbit. Radial velocity measurements reveal that TOI-836 b has a mass of $4.5\pm0.9$ M$_{\oplus}$ , while TOI-836 c has a mass of $9.6\pm2.6$ M$_{\oplus}$. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 minutes for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.